English verb conjugation
MUST CHIRP

Regular verb: chirp - chirped - chirped

Affirmation

Simple form	V-ing form
I must chirp you must chirp he must chirp we must chirp you must chirp they must chirp	I must be chirping you must be chirping he must be chirping we must be chirping you must be chirping they must be chirping
Perfect	V-ing perfect
I must have chirped you must have chirped he must have chirped we must have chirped you must have chirped they must have chirped	I must have been chirping you must have been chirping he must have been chirping we must have been chirping you must have been chirping they must have been chirping

Negation

Simple form	V-ing form
I mustn't chirp you mustn't chirp he mustn't chirp we mustn't chirp you mustn't chirp they mustn't chirp	I mustn't be chirping you mustn't be chirping he mustn't be chirping we mustn't be chirping you mustn't be chirping they mustn't be chirping
Perfect	V-ing perfect
I mustn't have chirped you mustn't have chirped he mustn't have chirped we mustn't have chirped you mustn't have chirped they mustn't have chirped	I mustn't have been chirping you mustn't have been chirping he mustn't have been chirping we mustn't have been chirping you mustn't have been chirping they mustn't have been chirping

Interrogative form

Simple form	V-ing form
must I chirp? must you chirp? must he chirp? must we chirp? must you chirp? must they chirp?	must I be chirping? must you be chirping? must he be chirping? must we be chirping? must you be chirping? must they be chirping?
Perfect	V-ing perfect
must I have chirped? must you have chirped? must he have chirped? must we have chirped? must you have chirped? must they have chirped?	must I have been chirping? must you have been chirping? must he have been chirping? must we have been chirping? must you have been chirping? must they have been chirping?

Interro-negative form

Simple form	V-ing form
mustn't I chirp? mustn't you chirp? mustn't he chirp? mustn't we chirp? mustn't you chirp? mustn't they chirp?	mustn't I be chirping? mustn't you be chirping? mustn't he be chirping? mustn't we be chirping? mustn't you be chirping? mustn't they be chirping?
Perfect	V-ing perfect
mustn't I have chirped? mustn't you have chirped? mustn't he have chirped? mustn't we have chirped? mustn't you have chirped? mustn't they have chirped?	mustn't I have been chirping? mustn't you have been chirping? mustn't he have been chirping? mustn't we have been chirping? mustn't you have been chirping? mustn't they have been chirping?